# git rev-parse -q --verify b9b8c8d3b4101788dd2c9ff5137baf7801a8f563^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git fixes-test
# git rev-parse -q --verify b9b8c8d3b4101788dd2c9ff5137baf7801a8f563^{commit}
b9b8c8d3b4101788dd2c9ff5137baf7801a8f563
# git checkout -q -f -B kisskb b9b8c8d3b4101788dd2c9ff5137baf7801a8f563
# git clean -qxdf
# < git log -1
# commit b9b8c8d3b4101788dd2c9ff5137baf7801a8f563
# Author: Christophe Leroy <christophe.leroy@csgroup.eu>
# Date:   Tue Dec 22 07:11:18 2020 +0000
# 
#     powerpc/32s: Fix RTAS machine check with VMAP stack
#     
#     When we have VMAP stack, exception prolog 1 sets r1, not r11.
#     
#     When it is not an RTAS machine check, don't trash r1 because it is
#     needed by prolog 1.
#     
#     Fixes: da7bb43ab9da ("powerpc/32: Fix vmap stack - Properly set r1 before activating MMU")
#     Fixes: d2e006036082 ("powerpc/32: Use SPRN_SPRG_SCRATCH2 in exception prologs")
#     Cc: stable@vger.kernel.org # v5.10+
#     Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
#     [mpe: Squash in fixup for RTAS machine check from Christophe]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/bc77d61d1c18940e456a2dee464f1e2eda65a3f0.1608621048.git.christophe.leroy@csgroup.eu
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 b9b8c8d3b4101788dd2c9ff5137baf7801a8f563
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig+UP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64e_defconfig
# Added to kconfig CONFIG_SMP=n
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig+UP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig+UP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig+UP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0xc62cac) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0xd00000)
Image Name:   Linux-5.10.0-gb9b8c8d3b410
Created:      Thu Dec 24 13:55:39 2020
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    4994306 Bytes = 4877.25 KiB = 4.76 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_ppc64e_defconfig+UP_powerpc-gcc5
# Build took: 0:03:46.122973